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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1044f88fe413b69ca4d9cb1e5a5a04cd4f1dffb7c5b99d2aff3ad570a0aafa50' 
  AND token = 'LYTwd7iRbX6F3qBeWVEmUjhxRnzBT+PY/chr/Vcm/1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}