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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990d03a22521aee70364e295ff05ec0ef9b46a85aae5fe3980d36b9da20af185' 
  AND token = 'WVSfnc3k3lW1hoKDGhL6vYy/2jTNCvQ1BYo0lSwzRHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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