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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee75b68bb97cec02ba043acf798e6a676b2e54932e40603ce72b9d4cd9e1f104' 
  AND token = '4Un/7EznTRVgGcQ9w+NKKAWCPiwrReyY2vMfijUo19w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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