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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b483ef614b0903dc92cd44b6af0d8913fddcec7ef1d55f7c516c167d715c005c' 
  AND token = 'cgwJAJl1Y5DO9bPYgeLxnRbHDqbryjgMDE4p2A8j4ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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