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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8462b8b3a87b625d01f5f806aee4dee2b1fa49e36a4a5b768d1a98823254f0f' 
  AND token = '5uonBFJlk8kBj7bZsku8nHS7Kogb4KPb+eF7tEPvLY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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