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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f3e286f71895a171b5ae15779624bce866a7a735344e44514190fe77f9de42' 
  AND token = 'R+h5CPISFhFTamqHEMWVjqPV8SBh1c8KAcCb9RxVgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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