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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9047c8d98f9a95c8c57e4dc009ebec9c20472044cb70e639e9a09011151193f5' 
  AND token = '5hFa5Oxi/xa4TJjLTP3SgF0Aqk81Oun+83VnvmHQkNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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