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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab87e9f1c859e51c0df8ff18425c0990a9d0615eb615997c7f5479179bd4969' 
  AND token = '4ptA8jkdwZFVacIFdfak8MS/3oLQPbrsoOW8H9Q7f0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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