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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bd0171f9fc6c3f3d9a8c06ca5f68e6312fc372f2921acc30339c9887f8abf3' 
  AND token = 'IVAvgxKkkX7Y7sSYVfOxHCgIA5qyhtgDdws91qFpD+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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