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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540c1e6f32cdd31db5a525559ad2933ac60aeebc26484808c8bdc7d433ddc033' 
  AND token = 'ijye4gCzXx70mSNiW01wdEEN8Yai16n8Ob0dpW4y/AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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