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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb862cff059960e2eb61fd3f70f8f1e6fcc0d723f20e13ce05f7a0a587074246' 
  AND token = 'bTemU5R11lLEAkkY54Figa/IFoQDkuwKk2jNyTwM9Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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