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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198c5132c07f7f73f54d9e021955fd70fab5c467e51ea18ff6510277812b93b0' 
  AND token = '6Gz1ZRtQSZermwehaRWZMYRWk9quSAkpmza2lMcQ/bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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