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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a4732648860d8a609d93a2e0d27abb35939fa97b4d3906b99bda8904b5512e' 
  AND token = 'eT0jKuU3FRlq53c49ouxUf4WKSZH9L1fhcqIAEhq79M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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