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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c93b2d943526570ef9c4dc0cc9e82ff747101d59a023829055fef3b63cce91' 
  AND token = 'wzyJGAX5JyaWwzP65FIxrGq5j6CBoAytiuLloaLRT5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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