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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118a164433821afce8b92a97058f8c022e8a36247efb4d8683d9e99570c788ee' 
  AND token = 'GGYG7EzUSXV/02mNzs683zOVE2kUvQnsjb4ds66SmGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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