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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03386cd6037a89c856ea7ae8ac7edf1fba20d2cbbcfe62fcde92838836b7b3f9' 
  AND token = 'm4bF02ceCRt9vTXTTAri+giBXpRX2qUx7nshpOVMaWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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