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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270b89ef8eaf952f8af9d47b5fef8ff1f5b6319017f9b89be445a8204819334e' 
  AND token = '0orrvWq76IvLLET2CITj9GvBz0iQsMFKMkAON6gYrkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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