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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec14916af90847c9d7872651e22b2aecb2e70605b0ba5b0ce1f92b67e0e6e4d6' 
  AND token = 'DNUG+9ITv16RY8Q+1TWHRIxDcQqNibnHMJ6+3F1R9iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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