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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7b37fa3f9ebdd1fbba6fde0f6eb9aedf95c2762b540b66a261012ff0ab1e68' 
  AND token = 'T+oVkOO3I6yvtsaQdysfLuCu2nHDWVFRqaoci0xFXVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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