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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b26da440e4ae91f58b1002451fbe6ebf6ec0cf1b4bbba68a840b5e69c8c58c' 
  AND token = '/hZ9OBp4460m6J91GMyeXOgvik5w8arofyFWb0wF5mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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