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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad161b2ba3a75cb2ec90ecc376b77961786c77c6395c62d621694ad094b44c54' 
  AND token = 'LnpMWpe7/rOU509CkeesPeZ+bGJJt0j0gE6fgZTOPg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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