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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bd616246b75363f06f75b5c7c251366ba2e415efe29d5df7e0416c1f13cd0a' 
  AND token = 'CnfZ3f6AkFwdZImykyduQIn4Z6I6Si2pDc5QFB+GDhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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