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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a050ada3edd69d343630ffeff3837da0202e8506754115bda992f9fc99d89f60' 
  AND token = 'H23bruZ1G0s/z8iV7lYIMOB5NB62jkeg/X+1jCwjnzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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