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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa6f79a8849d77e1f61e4ce7b0837112b105c69fb025f6eb6430b60e8bba19f' 
  AND token = '+mcczNeLiCUnjYCRGYbfUj6IqwxRGGtBtByUe7pmC+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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