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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb59fe87c219b972b84cccf62e7c96b8911e02d9d1a0b70fa3a9c6bc77eddba3' 
  AND token = 'j0zxAGcuvmM2lsAdareVM3gHGBONgiDgX1PDiGhfOEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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