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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b772050e83e499050be1d82cc0f1608565e7cb6589b3f392b8d289ad70a573cb' 
  AND token = 'L2mle2uddnnEmnZlV/FFoGMv4LoqIn7xSUzCl+srXx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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