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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d046df1f979e7372551b8c380d71a8db1329eef327de208d1a52475a197a08f' 
  AND token = 'ry18g0qFNxP4nCffcotzSKWRS1YkXAeUV3DO5h47PMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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