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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1e9345cc1cec19489dcb7994fdc7baf9be43d44f077ee2cba50669f847c5e1' 
  AND token = 'HOeR2T8VCwktgvfdJIA2OwCEpe9+V3lnYz7Nkc44K3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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