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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9812348c0b3065d61925f68e72dfdd48534f5c3862ca85ab3ade3082d19ef2f4' 
  AND token = 'XNjGJNHOSz+lraxfy+Mx10WgDfo16OiXFYMOdPpjyGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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