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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468bb6da8d64d3419b6866e63f773ea7a65854090b9265a7877adeaaaf6ffd0a' 
  AND token = 'QAMJTd9C890BjZ3KBDsmCzc1576R44CHO/E+0BePUVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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