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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bad9d5206a87631e801e5660b8d9172be7c74c51f15a538d035dfb9e1cd1f37' 
  AND token = 'PaUmQ2v13g/of/MibQjiZcgmJEs1Ks0G/3mcWoVIX40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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