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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717b29aa02fce231227e2659208650d6d59fc78080efd3966a9cf49c113e157b' 
  AND token = 'MORtx8E7S393PhMg4SyCKMrvdqhYKaUbA5ZNxsPIfUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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