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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9419f4576a13a82ce6ef5eab5c2a615bbf790e5a356b201fdf88a3d486fbb456' 
  AND token = 'bA3YTRay5iL/zwaHxHhLLznOw/eol3jFKDfGrLhg8fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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