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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1933d7508b7f50a55c554011212f383b33a6f861d450aa911d4b53fa8db763' 
  AND token = '2yoNy47dnBq7rI9j1vNszsUSphmNtawH8ldLa60ktc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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