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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e63f78e74900e35053fb162f3f63e6b3bca10aab622f1a615c564e139d5afe' 
  AND token = 'Xls7ajfThxajx7r3zHJMg25Dl8Vb1K+TbnlzNzWjq6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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