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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9616cc6e9ba75f4e290dc4622d63bbf6a4d86143a2f1d59e6a007ff5d784a5d2' 
  AND token = 'm6MVLJZw2VQBWitT6oT6Rs7IP977kugOcWslYegc6TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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