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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0ab8efd5fcc1bcffb012dcb9a487ae46f813f8f90b474362ce96dbadbaaef9' 
  AND token = '9exQ/i4dE/ZvCpivDyje69mHier2mnQllb6670XrExA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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