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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfae569226e0743a0e846cd2ff91123df7d5f36ec7ce5658c335e9fe5810a54' 
  AND token = 'QnJeAMcMx6sLbiDkcks9EcRf9MzstXxb3IKDXoJXDLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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