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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104a9105d61e7354e4e9fe99821fa967d034d9c15b12e87b03cfae8b77b020e3' 
  AND token = 'JzLi2wQnqUuJUb1tav14ND5Z1/PxQSvAlTMg4Rawwm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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