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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a51084b347f82db32fc7e2c5c76d274af3a0f12e088aa12503686060e1ef175' 
  AND token = 'ekQ/bH9aitS8d1ptHfAlqutSlyEg7TpQySfXzT8ry34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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