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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e6f7425de6dd90ea7869634ba54318995e31d5af777ca87e953cc576eea3f5' 
  AND token = 'xqbDDr2RIaN1lxcYFTCE+pxieaHhoRb5wQpCSAXbqag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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