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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ce27dabc54a46970f779eeb46bfc8105cd658ce6b9d35f57b2eaf29867bc23' 
  AND token = '1KjB31PsMPMXPAeKKeg+2ngI1zQqO1LTs2fZ7iRqhO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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