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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae09f834d61f448bb80f7a9c62039906abd41360c8803b3d9d73a6e5376611a' 
  AND token = 'CABVZ3VAFGoIyBh2LZy2fqAvs1bXnYMYU9IcWb29QjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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