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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c263943601d71230fc67a83a981fd4bcb41ea06f699a460744600bcceac1467c' 
  AND token = 'kmoM7V3MzAknG/f8YUUjdzsR2S96RpDI9vyW5TCXlFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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