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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877a12fe8f32ed515480ab6f45b14633cde8dc5ddc46e4697d6a4552e7083265' 
  AND token = 'j8iVy1FhJC9FyVxg+XbOLU425yPAv6XKX6yfOEnLihA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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