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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58818f4e55872263696eef6ee9b222b9dbdf7e1f3e9eecdb880a5761505981c' 
  AND token = 'fTRRsNRw3TgZYJmkvWtzv2DWQuo+dtdqwtRbG0tAJOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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