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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518e099480d3396c67f89bf2273c92cd7d4a4e607cde551ff1806c1df076a994' 
  AND token = '1ckAjD0JoUdNL1YSn1NU1qkuII+ET1kHwGERsT5PMg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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