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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06be50fc642fca2964a0f48ec2399d5479f1042dc662f06c1760d52d1ecff443' 
  AND token = 'FQMtIADtC1Rp/cFVDU8G6wmOnywYnzLTbTlahJ1ggpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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