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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523c75546765a710bbb6ad3619622e0f1481c93ae0d72a5af33800b64268e3f8' 
  AND token = 'SpJMXxDvK53Zd25s5EE+nqDbxe9/JIqW1W1Ec+QdW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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