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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76617882196a6ca43d4283d571e0c9a74fab26a1255b57bd1c8dd098c337c1fc' 
  AND token = 'mo0Q77b4qoR4wqHvE2pwUyWCGmhsIFkt9rYyjyrapQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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