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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d1a556d1e5bf48daf3d0664e3058812662425608c0a4f8a6ea8f9537f40824' 
  AND token = 'H8Ir3tG1JGfBe+YnNnznNNkIErT0N3NjUmFn0lM+gS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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