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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9792d1b44de1e7440eba74ad3a8171f15d37ef3c881d6882b32cff2bfbb7f64' 
  AND token = 'xDm0q5OUFtg2es0jfDU/lC6odiYm2YyZk6sBXG7Cubg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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