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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385374c8e0f509d4639e740b86f698aa2b0f487386eff993239eee2d6ad70ee0' 
  AND token = 'BRDHRR28lp7sfjuidvHj6Lp9ukRnJpXDsSIV3npq5AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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