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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0d4439e763f22d9ae2459d7b3ea0ae4b23a9eb833dd3772bb2a952049ad317' 
  AND token = 'vaZ4lk4yxWoZ5GtZ/CtCD/q1mVtHYxA85vnxlKHFFPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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