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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6b2563f517b9e3a6eaf9c2d8ebba03173bd57ba5957c37a41f9e09ec44e1a6' 
  AND token = '23IXux2CizlX30O43CRCb5tFuxU64Ef8iPoGzm5ywdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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