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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29499287f9dd03f916f8da827a267bece806e82811114665e5b9b4834fb391c0' 
  AND token = 'V6KA56w4FVi5VEa4qvf/NrMVb+d0+XnxkRmqFkiDW9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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