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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473449ddb2c5f4a85e84e4898a7850c15cb89c0ac55cf79944a5c733d94aa57' 
  AND token = 'BnT85BzZ8mDIIyfIwt7PKd4l4R+uXdceeEFGeMdx02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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