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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b1ae18c23e242b1f1d8043b631ae542c219d780a3b90250bd54d0f4b4c9cf1' 
  AND token = 'bcRTxAvsB3ImmcCRglf1Sg4b4xoesjnNqlS+Sg10jhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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