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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e73ad295e9472db2f8166518ffdfaa55d1fe972d45f69f85271875e9596701' 
  AND token = 'ojwVH+0JHdqWD9uZ9Pnt0bWX9nGeEb41aFHchm2i5RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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