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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a7b557ce498ec90e3a6d2a57d4c3bcbd22c0dc27eb5b076438671621ec4cf9' 
  AND token = 'H5a/7TH6UtRO/m64MoeM70yryZMGvqvPQxt8uLt4svs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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