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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b523acd2f1da67cd3d876e9a6c89ba54de435d5c5e425795c8c218f36e46ba88' 
  AND token = 'bYV/pAj5asXbJWIavXTj5J25z2O2HrG+AP0Ku7Voeno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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