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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c373d265a75b1e1d4faf087417fb19dd2d5ed27ac7f141f56f2123c79022832e' 
  AND token = 'WAo1XY9Mb2gCRrEi64FBevd+UlmrtYlWAfS5/3CzhpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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